Drying apparatus



A. HUILLARD.

DRYING APPARATUS. APPucATloN FILED AUG.13, 1913.

1,410,063. A 'Patented Mar. 21,1922@ .'flll! Q,

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ALPHONSE HUILLARD. OF SURESNES. FRANCE.

DRYING APPARATUS.

Speccation of Letters Patent. Patented D131'. 21, 1922.

y Application filed August 13, 1913. Serial No. 784,564.

(GRANTED UNDER THE PROVISIONS 0F THE ACT 0F MARGH 3, 1921, 41 STAT. L., 1313.)

To all 1072107211r 4it may Concern.'

Be it known'that I, ALPHONSE HUILLARD, citizen of the Republic of France. residing at Suresnes, in the Republicv `of France. have invented certain new and useful Improve ments in Drying Apparatus, of which the following is a specification.

This invention relates to drying apparatus having sieve floors arranged one above the other, and having apertures in the middle adjacent which are arranged transfer chambers which are provided wit-han ar-l rangement which allows of the transfer of the material from one floor to another without allowing the hot gases rising upwards from the bottom to pass through. l

The invent-ion relates more particularly to drying apparatus of the kind before mentioned, in which the transfer chambers are divided by fixed radial walls intoicompartmonts. and are covered at the ends with r0- tary discs which areprovided with slots displaced relatively to one another. so that a direct passage otv the material from One floor of the drying apparatus to the nextI` and consequently a free passage of the heated gases is prevented.

rlhese end discs are mounted on a vertical central shaft passing through the apparatus and must always remain in close contact with the end edges of the transfer chambers in order that the apparatus may work reliably.

As, however, the vertical central shaft under the action of the hot gases expands loncitiulinally considerably. it is necessary to arrange the end discs mounted on the shaft at a greater distance apart than corresponds to the depth of the transfer chambers. in order to obtain the space for play between the discs and the respective ends of the Jtransfer chambers necessitated by the variations in length of the shaft. rllhis causes the chambers to be incompletely closed against the passage of the gas current.

Now by this invention this disadvantage is avoided by the discs. instead of being mounted directly on the Shaft, being mounted on sleeves or bushes which are mounted ou the central driving shaft in Such a manner that they are not revoluble but are longitudinally' displaceahle, so that a close fitting of the discs on the end edges of the transfer nozzles can be maintained,

whilst allowing a free expansion of the shaft. y

.The two end discs may either be mounted on a bush common to both or each independently on a. separate bush.

in the first case the distance between the adjacent sides of the two discs must correspond as far as possible exactly to the distance between the two ends of the transfer chambers in order to ensure both discs fitting closely ontheseends. I

ln the second case each disc may be pressed independently by suitable means (springs, weighted levers or the like) against the end kof the chamber or both discs may be drawn together by a spring, and thus held in .close contact with the ends of the chamber. l l

In many cases it is desirable, in drying apparatus of the kind mentioned, to be able to vary the distance of the Scrapers, which are arranged to rotate above the sieve floors,

from. the centralv shaft and the distance of the lower edge of the scraper'from the sieve floor, also the inclination. of the scoops or Scrapers from a radial direction for the purpose of altering the speed of movement o f the material lying,T on the sieve {ioors towards the transfer chambers provided in the centre of the floors. ln order to enable these alterations to be made rapidly and easily in accordance with this invention, the scoops or Scrapers are Supported by the intermediary of scoop or scraper carriers adjustable on radial carrying arms fixed on the central driving shaft. The free ends of the scraper carriers are formed as vertical bushes, in which the shafts of the scoops or scrapers can be fastened by means of clamping screws or the like.

The invention is illustrated in the accompanying drawings:

Figurel is a longitudinal section of the drying apparatus;

Figure 2 a longitudinal Section on an-enlarged Scale of a chamber; and

Figures 3 and 4 are Side views on an enlarged scale of a scraper or Scoop with its holder;

Figure 5 is a fragmentary plan view showing more clearly the structure of the discs.

The material to be dried which is inserted through an upper aperture a passes on to the uppermost sieve door 7) and is conveyed towards the centre by the obliquely placed Scrapers e continuing on to the slot'cl in the .rotating discs e which cover the compartments of the transfer chambers. The dried material fills these compartments as the slot (l in the rotating upper disc e successively gives admission thereto. The discharge of the dried material onto the floor situated be` neath it is effected by the successive uncovering,r of the compartments by the rotating disc g when its slot It comes beneath the respective compartment, the latter being closed above by the solid part of the disc e, so that the hot gas can never pass directly through the compartments ofthe transfer chambers.

The material escaping from the chamber falls on to a conical guide surface and down the latter on to the outside edge of the next sleeve i'oor, Wl'lereupon the operations previously described are repeated.

The two discs e and g are secured to the ends of a bush l mounted in the hub le of the transfer nozzle f, which bush is not revolubly but longitudinally displaceably mounted on the vertical central shalt m. For the object a key a which is movable in a longitudinal groove in the sleeve is provided on the shaft. The scrapers c arrangedabove the sieve floors are connected by meansfof displaceable scraper carriers r with radial arms 0 (Figure 3) fixed onthecentral shat't m. These scraper holders are fixedby means of clamp yokes g whichV canbe drawn toether by screw bolts fw and allow the numer of the Scrapers, their radial distance from the central shaft, the inclination oi the scrapers out of the radial direction, and the height of the lower edges of the scrapers from the sieve floors to be easily and rapidly altered, whereby 'it is possible to regulate the speed ol movement of the material to be dried over the sieve floors and to ensure the uniformity of the distribution oi the material on the sieve iioors.

, Having now particularly described and ascertained the nature o' my said invention and in What manner the saine is to be peil formed, I declare that what I claim is:

A dryingapparatus having sieve floors aranged one above the other, and provided with apertures in the middle leading to transfer chambers Which are divided by radial Walls into compartments and are covered at their ends by rotating discs provided with relatively displacedv slots; in 'which 'these discs are carried by bushes which are mount ed on the vertical central shaft, in sucha manner to be longitudinally displaceable but not revoluble, `in order to enable the dises to tit closely on the ends of the transfer chambers even when the central sha-tt expands longitudinally under the action of the hot gases.

In witness whereof I have hereunto signed my name this 17th day of July 1913, in the presence'of tivo subscribing witnesses.

` ALPHONSE HUILLARD. Witnesses ANTONIO MONTOILHET, I-IANsoN C. Coxn. 

